/* author: http://www.codeproject.com/Members/zichun */

/* Event Functions */

// Add an event to the obj given
// event_name refers to the event trigger, without the "on", like click or mouseover
// func_name refers to the function callback when event is triggered
function addEvent(obj,event_name,func_name){
    if (obj.attachEvent){
        obj.attachEvent("on"+event_name, func_name);
    }else if(obj.addEventListener){
        obj.addEventListener(event_name,func_name,true);
    }else{
        obj["on"+event_name] = func_name;
    }
}

// Removes an event from the object
function removeEvent(obj,event_name,func_name){
    if (obj.detachEvent){
        obj.detachEvent("on"+event_name,func_name);
    }else if(obj.removeEventListener){
        obj.removeEventListener(event_name,func_name,true);
    }else{
        obj["on"+event_name] = null;
    }
}

// Stop an event from bubbling up the event DOM
function stopEvent(evt){
    evt || window.event;
    if (evt.stopPropagation){
        evt.stopPropagation();
        evt.preventDefault();
    }else if(typeof evt.cancelBubble != "undefined"){
        evt.cancelBubble = true;
        evt.returnValue = false;
    }
    return false;
}

// Get the obj that starts the event
function getElement(evt){
    if (window.event){
        return window.event.srcElement;
    }else{
        return evt.currentTarget;
    }
}
// Get the obj that triggers off the event
function getTargetElement(evt){
    if (window.event){
        return window.event.srcElement;
    }else{
        return evt.target;
    }
}
// For IE only, stops the obj from being selected
function stopSelect(obj){
    if (typeof obj.onselectstart != 'undefined'){
        addEvent(obj,"selectstart",function(){ return false;});
    }
}

/*    Caret Functions     */

// Get the end position of the caret in the object. Note that the obj needs to be in focus first
function getCaretEnd(obj){
    if(typeof obj.selectionEnd != "undefined"){
        return obj.selectionEnd;
    }else if(document.selection&&document.selection.createRange){
        var M=document.selection.createRange();
        try{
            var Lp = M.duplicate();
            Lp.moveToElementText(obj);
        }catch(e){
            var Lp=obj.createTextRange();
        }
        Lp.setEndPoint("EndToEnd",M);
        var rb=Lp.text.length;
        if(rb>obj.value.length){
            return -1;
        }
        return rb;
    }
}
// Get the start position of the caret in the object
function getCaretStart(obj){
    if(typeof obj.selectionStart != "undefined"){
        return obj.selectionStart;
    }else if(document.selection&&document.selection.createRange){
        var M=document.selection.createRange();
        try{
            var Lp = M.duplicate();
            Lp.moveToElementText(obj);
        }catch(e){
            var Lp=obj.createTextRange();
        }
        Lp.setEndPoint("EndToStart",M);
        var rb=Lp.text.length;
        if(rb>obj.value.length){
            return -1;
        }
        return rb;
    }
}
// sets the caret position to l in the object
function setCaret(obj,l){
    obj.focus();
    if (obj.setSelectionRange){
        obj.setSelectionRange(l,l);
    }else if(obj.createTextRange){
        m = obj.createTextRange();
        m.moveStart('character',l);
        m.collapse();
        m.select();
    }
}
// sets the caret selection from s to e in the object
function setSelection(obj,s,e){
    obj.focus();
    if (obj.setSelectionRange){
        obj.setSelectionRange(s,e);
    }else if(obj.createTextRange){
        m = obj.createTextRange();
        m.moveStart('character',s);
        m.moveEnd('character',e);
        m.select();
    }
}

/*    Escape function   */
String.prototype.addslashes = function(){
    return this.replace(/(["\\\.\|\[\]\^\*\+\?\$\(\)])/g, '\\$1');
}
String.prototype.trim = function () {
    return this.replace(/^\s*(\S*(\s+\S+)*)\s*$/, "$1");
};
/* --- Escape --- */

/* Offset position from top of the screen */
function curTop(obj){
    toreturn = 0;
    while(obj){
        toreturn += obj.offsetTop;
        obj = obj.offsetParent;
    }
    return toreturn;
}
function curLeft(obj){
    toreturn = 0;
    while(obj){
        toreturn += obj.offsetLeft;
        obj = obj.offsetParent;
    }
    return toreturn;
}
/* ------ End of Offset function ------- */

/* Types Function */

// is a given input a number?
function isNumber(a) {
    return typeof a == 'number' && isFinite(a);
}

/* Object Functions */

function replaceHTML(obj,text){
    while(el = obj.childNodes[0]){
        obj.removeChild(el);
    };
    obj.appendChild(document.createTextNode(text));
}
